Mercurial > hg > mercurial-crew-with-dirclash

annotate mercurial/mdiff.py @ 3409:1ae738bacf74

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Fixed page overlap for file revision links in hgweb. This is another step to fix issue189, but currently the file revision numbers are read as changeset revision numbers, so the link will point to the wrong revision.
author Thomas Arendsen Hein <thomas@intevation.de>
date Mon, 16 Oct 2006 09:53:31 +0200
parents 096f1c73cdc3
children abaee83ce0a6 544838cc1158
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
239
75840796e8e2 mdiff.py: kill #! line, add copyright notice
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diff changeset
1 # mdiff.py - diff and patch routines for mercurial
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2 #
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3 # Copyright 2005, 2006 Matt Mackall <mpm@selenic.com>
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4 #
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5 # This software may be used and distributed according to the terms
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6 # of the GNU General Public License, incorporated herein by reference.
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7
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8 from demandload import demandload
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9 import bdiff, mpatch
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10 demandload(globals(), "re struct util")
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11
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12 def splitnewlines(text):
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13 '''like str.splitlines, but only split on newlines.'''
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14 lines = [l + '\n' for l in text.split('\n')]
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15 if lines:
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16 if lines[-1] == '\n':
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17 lines.pop()
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18 else:
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19 lines[-1] = lines[-1][:-1]
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20 return lines
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21
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22 class diffopts(object):
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23 '''context is the number of context lines
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24 text treats all files as text
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25 showfunc enables diff -p output
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26 git enables the git extended patch format
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27 nodates removes dates from diff headers
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28 ignorews ignores all whitespace changes in the diff
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29 ignorewsamount ignores changes in the amount of whitespace
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30 ignoreblanklines ignores changes whose lines are all blank'''
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31
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32 defaults = {
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33 'context': 3,
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34 'text': False,
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35 'showfunc': True,
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36 'git': False,
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37 'nodates': False,
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38 'ignorews': False,
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39 'ignorewsamount': False,
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40 'ignoreblanklines': False,
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41 }
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42
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43 __slots__ = defaults.keys()
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44
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45 def __init__(self, **opts):
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46 for k in self.__slots__:
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47 v = opts.get(k)
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48 if v is None:
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49 v = self.defaults[k]
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50 setattr(self, k, v)
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51
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52 defaultopts = diffopts()
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53
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54 def unidiff(a, ad, b, bd, fn, r=None, opts=defaultopts):
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55 def datetag(date):
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56 return (opts.git or opts.nodates) and '\n' or '\t%s\n' % date
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57
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58 if not a and not b: return ""
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59 epoch = util.datestr((0, 0))
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60
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61 if not opts.text and (util.binary(a) or util.binary(b)):
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62 l = ['Binary file %s has changed\n' % fn]
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63 elif not a:
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64 b = splitnewlines(b)
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65 if a is None:
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66 l1 = '--- /dev/null%s' % datetag(epoch)
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67 else:
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68 l1 = "--- %s%s" % ("a/" + fn, datetag(ad))
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69 l2 = "+++ %s%s" % ("b/" + fn, datetag(bd))
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70 l3 = "@@ -0,0 +1,%d @@\n" % len(b)
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71 l = [l1, l2, l3] + ["+" + e for e in b]
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72 elif not b:
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73 a = splitnewlines(a)
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74 l1 = "--- %s%s" % ("a/" + fn, datetag(ad))
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75 if b is None:
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76 l2 = '+++ /dev/null%s' % datetag(epoch)
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77 else:
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78 l2 = "+++ %s%s" % ("b/" + fn, datetag(bd))
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79 l3 = "@@ -1,%d +0,0 @@\n" % len(a)
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80 l = [l1, l2, l3] + ["-" + e for e in a]
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81 else:
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82 al = splitnewlines(a)
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83 bl = splitnewlines(b)
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84 l = list(bunidiff(a, b, al, bl, "a/" + fn, "b/" + fn, opts=opts))
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85 if not l: return ""
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86 # difflib uses a space, rather than a tab
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87 l[0] = "%s%s" % (l[0][:-2], datetag(ad))
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88 l[1] = "%s%s" % (l[1][:-2], datetag(bd))
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89
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90 for ln in xrange(len(l)):
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91 if l[ln][-1] != '\n':
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92 l[ln] += "\n\ No newline at end of file\n"
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93
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94 if r:
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95 l.insert(0, "diff %s %s\n" %
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96 (' '.join(["-r %s" % rev for rev in r]), fn))
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97
0
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98 return "".join(l)
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99
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100 # somewhat self contained replacement for difflib.unified_diff
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101 # t1 and t2 are the text to be diffed
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102 # l1 and l2 are the text broken up into lines
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103 # header1 and header2 are the filenames for the diff output
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104 def bunidiff(t1, t2, l1, l2, header1, header2, opts=defaultopts):
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105 def contextend(l, len):
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106 ret = l + opts.context
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107 if ret > len:
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108 ret = len
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109 return ret
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110
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111 def contextstart(l):
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112 ret = l - opts.context
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113 if ret < 0:
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114 return 0
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115 return ret
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116
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117 def yieldhunk(hunk, header):
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118 if header:
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119 for x in header:
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120 yield x
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121 (astart, a2, bstart, b2, delta) = hunk
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122 aend = contextend(a2, len(l1))
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123 alen = aend - astart
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124 blen = b2 - bstart + aend - a2
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125
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126 func = ""
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127 if opts.showfunc:
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128 # walk backwards from the start of the context
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129 # to find a line starting with an alphanumeric char.
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130 for x in xrange(astart, -1, -1):
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131 t = l1[x].rstrip()
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132 if funcre.match(t):
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133 func = ' ' + t[:40]
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134 break
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135
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136 yield "@@ -%d,%d +%d,%d @@%s\n" % (astart + 1, alen,
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137 bstart + 1, blen, func)
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138 for x in delta:
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139 yield x
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140 for x in xrange(a2, aend):
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141 yield ' ' + l1[x]
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142
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143 header = [ "--- %s\t\n" % header1, "+++ %s\t\n" % header2 ]
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144
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145 if opts.showfunc:
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146 funcre = re.compile('\w')
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147 if opts.ignorewsamount:
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148 wsamountre = re.compile('[ \t]+')
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149 wsappendedre = re.compile(' \n')
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150 if opts.ignoreblanklines:
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151 wsblanklinesre = re.compile('\n')
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152 if opts.ignorews:
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153 wsre = re.compile('[ \t]')
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154
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155 # bdiff.blocks gives us the matching sequences in the files. The loop
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156 # below finds the spaces between those matching sequences and translates
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157 # them into diff output.
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158 #
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159 diff = bdiff.blocks(t1, t2)
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160 hunk = None
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161 for i in xrange(len(diff)):
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162 # The first match is special.
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163 # we've either found a match starting at line 0 or a match later
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164 # in the file. If it starts later, old and new below will both be
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165 # empty and we'll continue to the next match.
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166 if i > 0:
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167 s = diff[i-1]
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168 else:
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169 s = [0, 0, 0, 0]
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170 delta = []
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171 s1 = diff[i]
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172 a1 = s[1]
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173 a2 = s1[0]
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174 b1 = s[3]
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175 b2 = s1[2]
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176
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177 old = l1[a1:a2]
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178 new = l2[b1:b2]
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179
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180 # bdiff sometimes gives huge matches past eof, this check eats them,
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181 # and deals with the special first match case described above
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182 if not old and not new:
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183 continue
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184
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185 if opts.ignoreblanklines:
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186 wsold = wsblanklinesre.sub('', "".join(old))
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187 wsnew = wsblanklinesre.sub('', "".join(new))
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188 if wsold == wsnew:
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189 continue
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190
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191 if opts.ignorewsamount:
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192 wsold = wsamountre.sub(' ', "".join(old))
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193 wsold = wsappendedre.sub('\n', wsold)
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194 wsnew = wsamountre.sub(' ', "".join(new))
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195 wsnew = wsappendedre.sub('\n', wsnew)
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196 if wsold == wsnew:
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197 continue
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198
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199 if opts.ignorews:
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200 wsold = wsre.sub('', "".join(old))
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201 wsnew = wsre.sub('', "".join(new))
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202 if wsold == wsnew:
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203 continue
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204
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205 astart = contextstart(a1)
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206 bstart = contextstart(b1)
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207 prev = None
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208 if hunk:
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209 # join with the previous hunk if it falls inside the context
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210 if astart < hunk[1] + opts.context + 1:
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211 prev = hunk
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212 astart = hunk[1]
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213 bstart = hunk[3]
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214 else:
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215 for x in yieldhunk(hunk, header):
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216 yield x
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217 # we only want to yield the header if the files differ, and
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218 # we only want to yield it once.
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219 header = None
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220 if prev:
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221 # we've joined the previous hunk, record the new ending points.
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222 hunk[1] = a2
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223 hunk[3] = b2
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224 delta = hunk[4]
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225 else:
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226 # create a new hunk
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227 hunk = [ astart, a2, bstart, b2, delta ]
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228
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229 delta[len(delta):] = [ ' ' + x for x in l1[astart:a1] ]
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230 delta[len(delta):] = [ '-' + x for x in old ]
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231 delta[len(delta):] = [ '+' + x for x in new ]
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232
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233 if hunk:
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234 for x in yieldhunk(hunk, header):
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235 yield x
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236
120
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diff changeset
237 def patchtext(bin):
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238 pos = 0
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diff changeset
239 t = []
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diff changeset
240 while pos < len(bin):
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241 p1, p2, l = struct.unpack(">lll", bin[pos:pos + 12])
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242 pos += 12
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diff changeset
243 t.append(bin[pos:pos + l])
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diff changeset
244 pos += l
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245 return "".join(t)
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diff changeset
246
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diff changeset
247 def patch(a, bin):
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248 return mpatch.patches(a, [bin])
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249
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250 patches = mpatch.patches
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251 patchedsize = mpatch.patchedsize
432
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diff changeset
252 textdiff = bdiff.bdiff